Which of the following animals have scattered cells with cellular grade of organisation

Options

A. Hydra
B. Sponge
C. Gastrozooid
D. Gonozooid

Answer

To determine which of the following animals have scattered cells with a cellular grade of organization, we will analyze each option based on their organizational structure.

### Step-by-Step Solution:

1. **Understanding Cellular Grade of Organization**:
- The cellular grade of organization refers to a basic level where cells are not organized into tissues or organs. Instead, they exist as scattered cells that perform various functions independently.

2. **Analyzing the Options**:
- **Option 1: Hydra**:
- Hydra is a member of the phylum Cnidaria and exhibits a tissue grade of organization. It has organized layers of cells forming tissues, so it does not fit the criteria of having scattered cells. Therefore, this option is incorrect.

- **Option 2: Sponge**:
- Sponges belong to the phylum Porifera. They are characterized by having a porous body and do not form true tissues. The cells in sponges, such as pinacocytes, archaeocytes, and choanocytes, are scattered and perform different functions without forming organized tissues. This makes sponges the correct answer as they exhibit a cellular grade of organization.

- **Option 3: Gastrozoid**:
- Gastrozoids are specialized feeding structures found in certain Cnidarians (like hydra). They are part of a tissue grade of organization, as they are organized into structures that perform specific functions. Thus, this option is incorrect.

- **Option 4: Gonozoid**:
- Gonozoids are reproductive structures in Cnidarians. Similar to gastrozoids, they are part of a tissue grade of organization and not scattered cells. Therefore, this option is also incorrect.

3. **Conclusion**:
- The only animal from the options provided that has scattered cells with a cellular grade of organization is the sponge (Option 2).

### Final Answer:
**Sponge (Option 2)** is the correct answer as it exhibits a cellular grade of organization with scattered cells.

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